Abstract

A one-dimensional, transient, gas dynamic code CUDGEL, which solves the inviscid, zero conductivity Euler equations of compressible flow in a variable area nozzle with a prescribed heat source and basic through-flow is described. The model enables the computation of the effects of short-duration heat pulses, such as that produced by an Excimer laser on the gas flow. The propagation of shocks in the streamwise direction along the duct can be investigated, and the report gives the numerical background to such calculations using CUDGEL. The results of test calculations show that the code calculates the basic flow correctly. Some grid-refinement studies were also carried out on sound wave propagation to estimate numerical errors and code stability. Studies with single heat pulses, with characteristics expected in the Culham Excimer laser experiments by Fieret (1989), are also presented. These show the resultant flow disturbances and their propagation, including reflections. These results are predictions, made in advance of experiments. In its present form, the CUDGEL code is not suitable for analysing two-dimensional transient effects within the laser-heat source region itself.